Snack is a kind of food with specific style and characteristics in taste. It can be used as an ornament between banquets or as a staple food for breakfast and dinner. There are all kinds of snacks around the world, which are different from local customs and have distinctive features and unique flavors. Local snacks can highlight the local material, culture and social life, which is an indispensable feature of a region and the main target of homesickness for homeless people. Modern people usually don't eat snacks to satisfy their hunger. Besides satisfying their desires, they can also learn about local customs by tasting snacks with different local flavors. Some people can't eat too much because of small appetite or illness, and three meals are not enough to provide necessary nutrition, so they need to eat some extra snacks after meals. Snacks generally have a low starting point and low price, and most people can afford them.